US9001167B2 - Display panel having crossover connections effecting dot inversion - Google Patents
Display panel having crossover connections effecting dot inversion Download PDFInfo
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- US9001167B2 US9001167B2 US13/458,984 US201213458984A US9001167B2 US 9001167 B2 US9001167 B2 US 9001167B2 US 201213458984 A US201213458984 A US 201213458984A US 9001167 B2 US9001167 B2 US 9001167B2
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- subpixel
- subpixels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0254—Control of polarity reversal in general, other than for liquid crystal displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
- G09G2320/0214—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display with crosstalk due to leakage current of pixel switch in active matrix panels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
Definitions
- FIG. 1A depicts a typical RGB striped panel display having a standard 1 ⁇ 1 dot inversion scheme.
- FIG. 1B depicts a typical RGB striped panel display having a standard 1 ⁇ 2 dot inversion scheme.
- FIG. 2 depicts a novel panel display comprising a subpixel repeat grouping that is of even modulo.
- FIG. 9 shows a prior art four color arrangement for a display using a repeat cell consisting of four subpixels.
- FIGS. 3A and 3B depict the panel display of FIG. 2 with one possible set of crossover connections to provide a dot inversion scheme that may abate some undesirable visual effects.
- FIG. 4 shows one possible embodiment of a crossover as implemented.
- FIGS. 5A and 5B show one possible array of bonding pads without a crossover and with a crossover respectively.
- FIGS. 6A and 6B show yet another possible array of bonding pads without a crossover and with a crossover respectively.
- FIG. 7 depicts columns that might be adversely impacted by the effect of crossovers, if no compensation is applied.
- FIG. 8 depicts another solution to some undesirable visual effects on a repeat subgrouping of even modulo, with a change in dot inversion at driver chip boundaries.
- FIG. 1A shows a conventional RGB stripe structure on panel 100 for an Active Matrix Liquid Crystal Display (AMLCD) having thin film transistors (TFTs) 116 to activate individual colored subpixels—red 104 , green 106 and blue 108 subpixels respectively.
- AMLCD Active Matrix Liquid Crystal Display
- TFTs thin film transistors
- a red, a green and a blue subpixel form a repeating group of subpixels 102 for panel 100 .
- each subpixel is connected to a column line (each driven by a column driver 110 ) and a row line (e.g. 112 and 114 ).
- a dot inversion scheme to reduce crosstalk and flicker.
- FIG. 1A depicts one particular dot inversion scheme—i.e. 1 ⁇ 1 dot inversion—that is indicated by a “+” and a “ ⁇ ” polarity given in the center of each subpixel.
- Each row line is typically connected to a gate (not shown in FIG. 1A ) of TFT 116 .
- Image data delivered via the column lines—are typically connected to the source of each TFT.
- Image data is written to the panel a row at a time and is given a polarity bias scheme as indicated herein as either ODD (“O”) or EVEN (“E”) schemes.
- ODD ODD
- E EVEN
- row 112 is being written with ODD polarity scheme at a given time while row 114 is being written with EVEN polarity scheme at a next time.
- the polarities alternate ODD and EVEN schemes a row at a time in this 1 ⁇ 1 dot inversion scheme.
- FIG. 1B depicts another conventional RGB stripe panel having another dot inversion scheme—i.e. 1 ⁇ 2 dot inversion.
- the polarity scheme changes over the course of two rows—as opposed to every row, as in 1 ⁇ 1 dot inversion.
- both dot inversion schemes a few observations are noted: (1) in 1 ⁇ 1 dot inversion, every two physically adjacent subpixels (in both the horizontal and vertical direction) are of different polarity; (2) in 1 ⁇ 2 dot inversion, every two physically adjacent subpixels in the horizontal direction are of different polarity; (3) across any given row, each successive colored subpixel has an opposite polarity to its neighbor.
- two successive red subpixels along a row will be either (+, ⁇ ) or ( ⁇ ,+).
- FIG. 2 shows a panel comprising a subpixel repeating group 202 , as further described in the '225 application.
- subpixel repeating group 202 is an eight subpixel repeat group, comprising a checkerboard of red and blue subpixels 104 and 108 , respectively, with two columns of reduced-area green subpixels 106 in between.
- the following discussion may be applied to other subpixel repeating groups, such as a checkerboard of red and green with two columns of reduced area blue subpixels in between, without departing from the scope of the present invention. If the standard 1 ⁇ 1 dot inversion scheme is applied to a panel comprising such a repeating group (as shown in FIG.
- RGB striped panels namely, that successive colored pixels in a row and/or column have different polarities
- This condition may cause a number of visual defects noticed on the panel—particularly when certain image patterns are displayed.
- This observation also occurs with other novel subpixel repeating groups—for example, the subpixel repeating group in FIG. 1 of the '179 application—and other repeating groups that are not an odd number of repeating subpixels across a row.
- the traditional RGB striped panels have three such repeating subpixels in its repeat group (namely, R, G and B), these traditional panels do not necessarily violate the above noted conditions.
- Repeating group 202 of FIG. 2 in the present application has four (i.e. an even number of) subpixels in its repeating group across a row (e.g. R, G, B, and G). It will be appreciated that the embodiments described herein are equally applicable to all such even modulus repeat groupings (i.e. 2, 4, 6, 8, etc subpixels across a row and/or column)—including the Bayer repeat pattern and all of its variants as well as several other layouts incorporated by reference from the patent applications listed above.
- FIG. 9 is a prior art arrangement of four colors, sometimes called the Quad Arrangement, similar to the earlier Bayer pattern, but with one of the green subpixels replaced with a white.
- the repeat cell 120 consists of four subpixels, each of a different color, often red 104 , green 106 , blue 108 , and white 122 .
- subpixel repeating group 202 of FIG. 2 looks like:
- FIG. 2 depicts that the green subpixels are of reduced area as compared to the red and blue subpixels themselves, it will be appreciated that all subpixels may be the same size or that other subpixel dimensioning is possible without departing from the scope of the present invention.
- Pattern 1 R+G+B+G ⁇ R ⁇ G+B ⁇ G ⁇ [REPEAT]
- Patterns 1 through 4 above exemplify several possible basis patterns upon which several inversion schemes may be realized.
- a property of each of these patterns is that the polarity applied to each color alternates with each incidence of color.
- polarity inversion patterns can then be implemented upon a panel having subpixel repeating group 202 and Patterns 1 - 4 as a template.
- a first embodiment of pattern 1 is shown above.
- the first row repeats the polarities of pattern 1 above and then, for the second row, the polarities are inverted.
- applying alternating 2 row inversion alternating polarities of R and B in their own color planes may be realized.
- the Gs alternate every second row.
- the second embodiment of Pattern 1 shown above allows for alternating Gs every row.
- Polarity inversion patterns such as the ones above, may be implemented at various stages in the system.
- the driver could be changed to implement the pattern directly.
- the connections on the panel glass could be rerouted.
- FIG. 3A is one embodiment of a set of crossover connections that implements Pattern 2 above in a panel 300 .
- Crossovers 302 are added to interchange the column data on columns 2 and 3 , 5 and 6 , etc.
- two crossovers are added in this embodiment per every 8 columns.
- FIG. 3B depicts how a driver circuit coupled to panel 300 provides image data signals to panel 300 to effect the polarity inversion of Pattern 2 using the set of crossover connections of FIG. 3A .
- Other patterns may be implemented with different sets of crossovers without departing from the scope of the present invention.
- FIG. 4 shows a typical crossover.
- Driver pads 402 are connected to driver lines 404 which extend down as a column line to intersect with gate lines 408 and send data through TFT 410 .
- an insulator layer ( 406 ) may be placed so as to prevent shorts and other problems.
- Driver lines 404 and insulator layer 406 can be fabricated using standard LCD fabrication techniques.
- FIG. 5A shows an array of bonding pads 502 . Each pad has a given polarity—the output of which is shown at the bottom of the driver lines 504 .
- the bonding pads shown in FIGS. 5A and 5B are approximately 80 um square with a 80 um space. With such a spacing, it is possible to form crossover 506 as shown in FIG. 5B . As may be seen, this “swap” may be accomplished by rerouting the traces on the glass or the TAB chip carrier as shown.
- FIGS. 6A and 6B show yet another embodiment of crossover connections to implement polarity patterns as described above.
- FIG. 6A depicts the bonding pads 602 as another array of such pads—each pad effecting a polarity on the column lines 604 , the polarity of which is shown at the bottom of each such line.
- FIG. 6B shows how a crossover 606 could be effected with such a pad structure.
- the bonding pads could be for chip on glass COG or for inner lead or outer lead bonds on a tape chip carrier. In such a case, with 80 um column spacing, the bonding pads are now 40 um with 40 um space—i.e. with enough room to route the leads as shown.
- FIG. 7 shows one embodiment of a panel 700 having crossovers.
- these columns may be slightly darker or lighter than the other columns.
- This effect is caused by coupling capacitance between the source (data) lines and the pixel electrodes. Normally, each source line is the opposite polarity so the coupling of extraneous voltages is canceled on the pixel electrode. If the source lines are the same polarity, then the pixel voltage will be reduced and the pixel column will appear darker or lighter.
- This effect is generally independent of the data voltages and can be compensated by a correction signal added to the voltage of the dark or light column. Furthermore, this visual effect can occur when horizontally adjacent pixels have the same polarity.
- the mechanism for the darkening or lightening is the parasitic capacitance between the data line to the pixel electrode.
- the effect of the parasitic coupling from each data line tends to cancel each other.
- the polarities of each data line are the same, they will not cancel each other, and there will be a net bias applied to the pixel electrode. This net bias will have the effect or lowering the magnitude of the pixel electrode voltage. For normally black LCD panels, the effect will be to darken the pixel. For normally white LCD panels, the effect will be to lighten the pixel.
- FIG. 8 shows a panel 800 having the same subpixel repeating subgrouping as FIG. 2 .
- Standard driver chips 802 and 804 are used to drive the column lines 806 —and effecting a 1 ⁇ 2 dot inversion scheme as shown.
- same color subpixels across a row under one such chip (say 802 ) and might cause some shadowing this visual effect is somewhat abated by reversing the inversion scheme at the chip boundary 808 .
- the same colored subpixels under chip 804 will have different polarities as those under chip 802 which abates the shadowing.
- the column at the chip boundary 808 will be darker or lighter than the other columns—unless compensated.
- a predetermined voltage can be added to the data voltage on the darker or lighter columns so as to compensate for the dark or light column.
- This correction voltage is independent of the data voltage so can be added as a fixed amount to all darker or lighter columns.
- This correction value can be stored in a ROM incorporated in the driver electronics.
- a second compensation method is the look forward compensation method.
- this method each of the data values of the pixels connected to data lines adjacent to the affect pixel are examined for the subsequent frame. From these values, an average compensation value can be calculated and applied to the affected pixel. The compensation value can be derived to a precision suitable to the application.
- This method requires a frame buffer to store the next frame worth of data. From this stored data, the compensation value would be derived.
- a third method is the look back method. Under the assumption that the frame to frame difference in the compensation value is negligible, the data from the previous frame's data may be used to calculate the compensation value for the affected pixel. This method will generally provide a more accurate compensation value than the first method without requiring the frame buffer described in the second method. The third method may have the greatest error under some specific scene changes. By detecting the occurrence of those scene changes, the look back compensation may be turned off, and an alternate method, such as no compensation or either of the compensation methods described above, may be applied for that circumstance.
- crossover connections or polarity inversions be placed for every occurrence of a subpixel repeating group. Indeed, while it might be desirable to have no two incidences of a same-colored subpixel having the same polarity, the visual effect and performance of the panel, from a user's standpoint, might be good enough to abate any undesirable visual effects by allowing some two or more incidences of same-colored subpixels (in either a row or column direction) to have the same polarity. Thus, it suffices for the purposes of the present invention that there could be fewer crossover connections or polarity inversions to achieve a reasonable abatement of bad effects. Any fewer number of crossover connections or polarity inversions could be determined empirically or heuristically, while noting the visual effects thereof, in order to achieve satisfactory performance from a user's standpoint.
Abstract
Description
-
- R G B G
- B G R G
-
- (+) 1. R+G+B+G−R−G+B−G−[REPEAT]
- (+) 2. B−G−R−G+B+G−R+G+[REPEAT]
- (−) 3. R−G−B−G+R+G−B+G+[REPEAT]
- (−) 4. B+G+R+G−B−G+R−G−[REPEAT]
Second Embodiment of Pattern 1: - (+) 1. R+G+B+G−R−G+B−G−[REPEAT]
- (+) 2. B−G−R−G+B+G−R+G+[REPEAT]
- (−) 3. R−G+B−G−R+G+B+G−[REPEAT]
- (−) 4. B+G−R+G+B−G−R−G+[REPEAT]
Claims (8)
Priority Applications (1)
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US13/458,984 US9001167B2 (en) | 2003-06-06 | 2012-04-27 | Display panel having crossover connections effecting dot inversion |
Applications Claiming Priority (3)
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US10/455,925 US8035599B2 (en) | 2003-06-06 | 2003-06-06 | Display panel having crossover connections effecting dot inversion |
US13/232,546 US8633886B2 (en) | 2003-06-06 | 2011-09-14 | Display panel having crossover connections effecting dot inversion |
US13/458,984 US9001167B2 (en) | 2003-06-06 | 2012-04-27 | Display panel having crossover connections effecting dot inversion |
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US13/232,546 Division US8633886B2 (en) | 2003-06-06 | 2011-09-14 | Display panel having crossover connections effecting dot inversion |
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US20120206509A1 US20120206509A1 (en) | 2012-08-16 |
US9001167B2 true US9001167B2 (en) | 2015-04-07 |
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US10/455,925 Active 2027-04-25 US8035599B2 (en) | 2003-06-06 | 2003-06-06 | Display panel having crossover connections effecting dot inversion |
US13/232,546 Expired - Lifetime US8633886B2 (en) | 2003-06-06 | 2011-09-14 | Display panel having crossover connections effecting dot inversion |
US13/458,984 Expired - Lifetime US9001167B2 (en) | 2003-06-06 | 2012-04-27 | Display panel having crossover connections effecting dot inversion |
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US10/455,925 Active 2027-04-25 US8035599B2 (en) | 2003-06-06 | 2003-06-06 | Display panel having crossover connections effecting dot inversion |
US13/232,546 Expired - Lifetime US8633886B2 (en) | 2003-06-06 | 2011-09-14 | Display panel having crossover connections effecting dot inversion |
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US (3) | US8035599B2 (en) |
KR (2) | KR101048364B1 (en) |
CN (1) | CN1799086B (en) |
TW (1) | TWI253617B (en) |
WO (1) | WO2005001798A2 (en) |
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Also Published As
Publication number | Publication date |
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TWI253617B (en) | 2006-04-21 |
WO2005001798A2 (en) | 2005-01-06 |
KR101048364B1 (en) | 2011-07-11 |
US20120001965A1 (en) | 2012-01-05 |
US8035599B2 (en) | 2011-10-11 |
CN1799086B (en) | 2010-08-11 |
TW200514010A (en) | 2005-04-16 |
WO2005001798A3 (en) | 2006-02-09 |
US20040246213A1 (en) | 2004-12-09 |
CN1799086A (en) | 2006-07-05 |
US8633886B2 (en) | 2014-01-21 |
KR20100130238A (en) | 2010-12-10 |
US20120206509A1 (en) | 2012-08-16 |
KR101058119B1 (en) | 2011-08-24 |
KR20060006090A (en) | 2006-01-18 |
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